The Aurora toolset reference article from the English Wikipedia on 24-Apr-2004
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Aurora toolset

Time you got around to sponsoring a child
The Aurora toolset is supplied with the computer role-playing game Neverwinter Nights to generate new modules for the game - this means that you can create your own stories and play them out within the game. Aurora is the 3D graphics engine that is used by Neverwinter Nights.

The areas use a tileset system, and its scripting capabilities allow builders to customize much of the game system.